Hallo hase,
keine Ahnung, warum Deine Tabelle nicht geht,
aber das geht:
<table width="800px" height="600px" border="4" bordercolor="#FF0000" cellspacing="0" cellpadding="0" bgcolor="#717171" style="table-layout:fixed" align="center">
<tr valign="top"><td style="height:57px" background="oben.gif"></td></tr>
<tr valign="top"><td>
<table height="100%" border="0" cellspacing="0" cellpadding="0" width="100%">
<tr valign="top">
<td width="34%" style="height:361px; background-repeat:no-repeat;" background="links.gif"> </td>
<td width="50%" bgcolor="#ACACAC">gdxhf</td>
<td style="background-repeat:no-repeat" background="rechts.gif"> </td>
</tr>
</table></td></tr>
<tr><td style="height:182px; background-repeat:no-repeat;" background="unten.gif" valign="top">
<br><center><img src="schatten.gif" border="0"></center>
</td></tr>
</table>
Ist es das, was Du wolltest ?
Gruß Elix